Include Upload pattern progress bar styles for use by widgets #698
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Upload pattern previously omitted any styles for progress bar, which breaks upload display of progress bar in plone.app.widgets 1.x (e.g. in TinyMCE upload tab).
This fixes that; it also fixes lack of the bootstrap scaffolding for the .sr-only selector.
LESS Imports are done by reference to keep resulting file size low. This style fix is very low risk: while it adds about 1.2k to the built widgets.min.css, once gzipped, the difference is only 64 additional bytes served over a compressed connection.